# Calculates the number of days from January 01, 2000 to a specified day _php basis

Source: Internet
Author: User
This is a function that calculates the number of days from January 01, 2000 to a specified day
<br>
(Calculate head also count tail) date format is: YYYY-MM-DD
<br>

<?php
Calculate the number of days from January 01, 2000 to one day

function Cal_start2end (\$end _day, \$start _day)
{

\$start _day=ereg_replace ("-", "", \$start _day);
\$end _day=ereg_replace ("-", "", \$end _day);

if (\$end _day>= \$start _day)
{//Due date is greater than start date
if (substr (\$end _day,0,4) ==substr (\$start _day,0,4))
{

if (Is_int (substr (\$end _day,0,4)/4))
\$leap _day=29; Leap year
Else
\$leap _day=28;

Same year

if (substr (\$end _day,4,2) ==substr (\$start _day,4,2))
{
The same month
\$endday _from_startday= \$end _day-\$start _day+1;

}
Else
{
Not same month

Switch (substr (\$end _day,4,2))
{
Case "01":
\$endday _from_newyear=substr (\$end _day,6,2) +1;
Break
Case "02":
\$endday _from_newyear=substr (\$end _day,6,2) +31;
Break
Case "03":
\$endday _from_newyear=substr (\$end _day,6,2) + \$leap _day+31;
Break
Case "04":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*2;
Break
Case "05":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*2+30;
Break
Case "06":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*3+30;
Break
Case "07":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*2+30*2;
Break
Case "08":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*3+30*2;
Break
Case "09":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*5+30*2;
Break
Case "10":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*5+30*3;
Break
Case "11":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*5+30*4;
Break
Case "12":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*5+30*5;
Break
}
\$endday _from_startday= \$endday _from_newyear;
}

Return (\$endday _from_startday);

}
Else
{
Different years!

\$differ _year=substr (\$end _day,0,4)-substr (\$start _day,0,4);

\$how _int_4_floor=floor (\$differ _year/4) +1; Rounding down
\$how _int_4_ceil=ceil (\$differ _year/4) +1; Rounding up

if (\$how _int_4_floor== \$how _int_4_ceil)
\$how _leap_year= \$how _int_4_floor-1;
Else
\$how _leap_year= \$how _int_4_floor;

\$how _noleap_year= \$differ _year-\$how _leap_year;

\$differ _year2day= \$how _noleap_year*365+ \$how _leap_year*366;

if (Is_int (substr (\$end _day,0,4)/4))
\$leap _day=29; Leap year
Else
\$leap _day=28;

if (substr (\$end _day,4,2) ==substr (\$start _day,4,2))
{
The same month
\$endday _from_startday= \$differ _year2day+ substr (\$end _day,4,2);

}
Else
{
Not same month

Switch (substr (\$end _day,4,2))
{
Case "01":
\$endday _from_newyear=substr (\$end _day,6,2) +1;
Break
Case "02":
\$endday _from_newyear=substr (\$end _day,6,2) +1+31;
Break
Case "03":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31;
Break
Case "04":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*2;
Break
Case "05":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*2+30;
Break
Case "06":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*3+30;
Break
Case "07":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*2+30*2;
Break
Case "08":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*3+30*2;
Break
Case "09":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*5+30*2;
Break
Case "10":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*5+30*3;
Break
Case "11":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*5+30*4;
Break
Case "12":
\$endday _from_newyear=substr (\$end _day,6,2) +1+ \$leap _day+31*5+30*5;
Break
}//end of Switch

\$endday _from_startday= \$endday _from_newyear+ \$differ _year2day;
}//end of not same month

Return (\$endday _from_startday);

}//end of year
//end of \$end _day>= \$start _day

}//end of function

\$start _day= "2000-01-01";

\$end _day= "2011-01-01";

echo "You entered is:". \$end _day. " <br>\n ";
\$endday _from_startday=cal_start2end (\$end _day, \$start _day);

echo "This day distance \$start_day altogether". \$endday _from_startday. "Day";

?>
<br><br><br><br> time is too little, the prawn can be modified to calculate the interval between any two dates best!!!!!
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